Aim of the Experiment :
In this experiment you will learn the basics concepts of digital communications like pulse shaping filters, Nyquist criterion, eye diagram, inter-symbol interference and clock recovery. You will learn digital data transmission using baseband pulse amplitude modulation
Before you start with the experiments it is necessary that you understand the concepts involved in the experiment. You have to understand
Baseband PAM
Nyquist criterion
Inter-symbol Interference (ISI)
Pulse shaping (raised cosine baseband filtering)
Eye diagrams
Interpolation filter bank
Symbol clock recovery
Equipment to be checked out :
Two BNC - BNC Jack cables
Two BNC - stereo pin (DSP) cables
Deviations from the laboratory manual :
For the Simulation Exercises
All the simulation exercises should be done using MATLAB and run in LRC (you cannot run them in the second floor lab).
You have to submit the output and the source code of the simulation programs. All the plots have to be properly labeled.
For the Hardware Exercises
Generate the eye diagram for 4 level PAM. Compare them with the theoretical predictions and account for any discrepancy.
In the clock recovery system, discuss the need for a Prefiltering. What would be the output if the prefilter filters out the clock frequency (would it be possible to recover the clock frequency) ?
Assignment
Submitting this assignment is optional, but doing it would be useful
with your QUIZ preparations